Feeding mechanism for overseaming sewing machines



April 16, 1929. H.- A. KLEMM 1,709,793

7 FEEDING MECHANISM FOR OVERSEAMING SEWING MACHINES Filed April 16, 1927 2 Sheets-Sheet l 8 woe-n tor Herma nnfl K I 6371140 35117111 GHQ 014% H. A. KLEMM April 16, 1929.

FEEDING MECHANISM FOR OVERSEAMING SEWING MACHINES 2 Sheets-Sheet Filed April 16, 1927 avwewto'c fjkrmann (HIV/6mm,

3 13 :5 alibi/nay Patented Apr. 16, 1929.

HEEMANN A. KLEMM, OF IQAIVEARONECK,

new Yon-K, Assrenoa To UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORP ORATION OF ILLINOIS.

FEEDING MECHANISM FOR OVERSEAMING SEWING MACHINES.

Application filed April 16, 1927. Serial No. 184,283.

This invention relates to sewing machines of the overseaming type wherein the fabric or other material to be sewed is fed to the stitching mechanism in a vertical direction between a pair-of co-operating and intermittently operated fabric feeding wheels, and it is the object of the invention to provide improved actuating means for the fabric feeding wheels.

In the drawings accompanying and forming a partof this specification Figure l is a side elevation, partly in sect-ion and broken away, of the fabric feeding means of an over seaming sewing machine with my improved actuating means applied thereto, and showing the operative connection thereof with the driving shaft of the machine, only so much of the sewing machine mechanism being shown as is essential to an understanding of the invention.

Figure 2 is a plan-view withpart of the sewing machine casing broken away.

Figure '3 is a view, on an enlarged scale, looking at the bottom of my improved actuating means for the fabric feeding wheels.

Figure 4 is a cross sectional view taken on the line 44 of Figure 5 looking in the direction of the arrow.

Figure 5 is a sectional view taken on the line 55 of Figure 4: looking in the direction of the arrows. v

Figure 6 is a perspective view of a portion of the lever forming a part of the actuating means forthe fabric feeding wheels; and

V Figure 7 is a longitudinal sectional view of a detail, of the actuating means.

In carrying out the embodiment of the in Vention illustrated in-the drawings there is shown only so muchfof an overseaming sewing machine as is essential to an understanding of the invention. The operative parts are mounted on a casing C, only a part of which is shown, having a drive shaft 8 rotatably mounted in the side walls thereof with a belt wheel 9 fixed'thereon. A feed wheel 10 is fixed to a shaft 11 mounted to rotate on a vertical axis in a bracket 12 fixed to the casing. A co-operating feed wheel 13 is fixed to a shaft 14 mounted to rotate in a bracket 15 pivotally or hingedly connected, as at 16, with the bracket 12 whereby it is adapted to be moved to position with the wheel 13 to coact with the wheel 10 with the shaft 14 in parallel relation to the shaft 11, and adapted to be moved laterally away from the wheel 10 to permit of the insertion of the .material or fabric to be sewed between the feed wheels 10, 13. The'shafts are positively driven one from the other by gears 17, 18 fixed to the respective shafts 11, 14:. A needle carrying bar and rod carrying a looper operative to enter the looper into the needle loop at one side of the material and which operates to cross the material to the opposite side thereof (not shown herein) are of the usual construction and arranged above the feed wheels 10, 13.

Tointermittently rotate the wheels 10, 13 I i to feed the fabric or other material to the stitching and seaming mechanism a flanged disk or cupped member 19 is fixed to the shaft 11 by set screws with the flange extending downward. The brackets 12, 15 are arranged at the lower end with hood members '20, 21 to form an enclosing housing forthe flanged disk and gears 17, 18. An arm 22 is carried by a bracket 23 fixed to the hood 20 below and to intersect the disk flange. A, lever is loosely mounted on the hub of the flanged disk to swing about the shaft 11 below the flange disk, said lever being arranged with multiple arms, in the present instance three in number 24, 25 and 26, the arms 24, 25 extending dian letrically opposite from each other and the arm 26 extending at a right angle to said arms. The fixed arm 22 and each of the lever arms is arranged with a pan: of fixed ledges, which are in the nature of aws, to extend laterally from one face thereof and at opposite sides and in spaced relation to the disk flange. v While the jaws may be constructed integral with the arm and lover thereof they areof hardened metal and I arm and lever; As theconstr'uction and arrangement of'the respective pairs of jaws is the same a detail description of one pair of jaws is deemed to be sufficient.

The i aw at the outer side of the disk flange comprises a block 27 secured to the fixed and lover arms by screws 28, said block having an arcuate portion 29 arranged concentric to and spaced from the disk flange, An opening 30 is drilled into one end of the block and extends at an angle through the arcuate portion and when the block is secured in position on the arms forming with the disk flange a tapered or cuneiform socket. The aw at the inner side of the disk flange also comprises a block secured to'the fixed and lever arms to the inner surface of'the disk fiange being of arcuate form and in an arc of a circle concentric with the inner wall of the disk flange.

direction toward Sftlt I fitj-inserted into the sockets and interposed be The face 38 is arranged with a recess extending longitudinally of the block and of curved form in cross section, said recess being of greater depth at one end than the opposite end to form with the disk flange a tapered or cuneiform socket. The sockets formed by the respective blocks a-re'arranged sothat the smaller or. reduced ends of the, sockets are at the same end, as clearly shown in Figure l. Independently movable. and self adj usting wedge members, shown as com.-

p1. ng balls 35, are inserted into the larger end of the sockets, said balls being of a diameter less than the'cross sectional area of the socketsat the redue d ends, and urged in a redneed ends bysprln gs tween the balls and clips 3'? at the outer or larger ends of the sockets. These clipsare arranged onplates 38by bonding the ends laterally and are fixedupon the fined and lever arms atthesides opposite to the jaws by insorting the same intransverse recesses and securing them therein by. screws 39. The

inner a-ndouter surfaces oft-he disk flange are arranged. with annular recesses 40, l1 1n opposedrelat on ,to the recesses 1-11 the jaws to formraceways and guides for. the balls.

The disk and thereby the. feeding wheel Carrying, shafts. are intermittently "rotated to feedthe' fabric between thelfee'd wheels through aneccentric 42,011 the drive shaft 8, a. a p is embracing theeecentric and being connected bya link 44: toaanember 45 having a universal joint connection-with an arm 46 which, is extended through on opening in the casing andfixed to a rockshaftd? mounted-jnlugs 48 of a bracket fixed to the casing. A second arm l9 fixedto saidshaft 47 carries a stud 50 a'djustably. mounted in a slotin said arm, a link 51 is pivotally mounted on said stud and has a pivotal connection 52 with the multiple arm jaw carrying lever. As saidv lever is movedin. clockwise direction througlrits connectionwith the drive shaft 8 it. will cause the balls carriedby the lever arms -to be wedge'd jhetween the jaws carried therebyv and the disk flange, thereby. connecting the disk to the lever and transmittingthe movement of, the, latter to said disk and the connected feed wheclcarrying shafts. During this-movement ofthe disk the balls carried by the fixed arm 22 will' he moved against the tension of the springs 33 and into the enlarged portion of. the sockets releasing the disk from-said arm. I As the lever is moved in counter-clockwise direction the ballscar- 'ried by the lever will move against the tensionof the springs into the enlarged portion of the sockets releasingtheleverfrom the disk,

and simultaneously therewith the balls carried by the fixed arm 22 will be caused to move me. dircctiontoward thereduced portion of the sockets and become wedged between the jaws carried by said arm and the disk flange thereby firmly holding the disk and feed wheel carrying shafts against retrograde movement. To vary the feeding movement of the feed wheels the link carrying stud 50 is adjusted in the slot of arm 49 thereby vary-- flange, and means in said. sockets operative when the lever is moved in one direction to connect the lever with and transmit the movement thereof to the disk and shaft and release the lever thcref-ron'i whenmoved in the opposite direction.

2. In an intermittently rotatable device, a rotatable shaft, means to intermittently rotate said shaft in one direction.comprisingj a disk; havinganannular flange fixed to one of said shafts, a lever loose on-sai-d disk to swing aboutt-he axisof theshaftand-juxtaposed to the disk flange andi-having fixed jaws to engageat opposite sidcsof and in spaced relation to the disk flange andzarrangedto form with the disk flange tapered SQCkGtS,-aI1d indepcndently self-adjusting members. in said sockets. automatically operative when the lever. is moved in onedirection and wedged between the jaws and disk flangeto'connect the lever with the diskand impart the movement thereof to the shaft and release the lever therefrom when moved in reverse direction.

3,. An intermittently rotatable device, as claimed in claimQ, a fixed arm'intersecting the disk flange having fixed jaws to engage at opposite sides of and-in, spaced relation to the disk flange arranged to form with the disk flange tapered sockets at opposite, sides of the disk-flange, and independently adj ustable membersinsaidisockets.operative to release thedisk from thearm when-the lever is moved in-the one direction to effect operation of the other members to connect the shaft with and impart the movement: of the lever to the shaft, andoperative to connect the disk with the fixed arm and hold the dis-kand-shaft against movement when the lever is moved in reverse direction. j v

4. An intermittently rotatable device as claimed in claim 2, wherein the independently self-adjustable. members comprise wedge members yieldingly. urgediina direction toward the reduced end of the sockets.

5. An intermittently rotatable device as claimed in claim 2, wherein the independently self-adj ustable members comprise balls, raceways for the balls arranged in the disk flange and jaws, and springs to urge the balls in a direction toward the reduced ends of the sockets.

6. In an intermittently rotatable device, a rotatable shaft, means to impart intermittently rotative movement to said shaft, comprising a disk having an annular flange fixed to the shaft, a fixed arm intersecting the disk flange having jaws to engage at opposite sides of the disk flange, a lever loose on the disk and intersecting the disk flange having jaws to engage at the opposite sides of the disk flange, said arm and lever jaws being arranged to form with the disk flange tapered sockets, and independently movable wedge members in said sockets, said members in the lever sockets being adapted .to be wedged in the sockets between the jaws and disk flange to connect the lever with said disk when moved in one direction and release the wedge members in the arm sockets to impart the 'movement of the lever to the disk and shaft,

and release the wedge members in the lever sockets when reverse movement is imparted to the lever, and the wedge members in the arm sockets during said latter movement of the lever moved to position to hold the disk againstretrograde movement.

7 An intermittently rotatable device as claimed in claim 6, wherein the lever is arranged with multiple arms and each arm is provided with the jaws to form wedge member carrying sockets.

8. An intermittently rotatable device as claimed in claim 6, wherein the lever is arranged with multiple arms, two of the arms extending diametrically opposite and the other arm extending at a right angle to the first arms, and each arm is arranged with jaws to engage at opposite sides of the disk flange and form therewith tapered Wedge member carrying sockets.

9. An intermittently rotatable device as claimed in claim 6, wherein the lever is arranged with multiple arms and each arm is arranged with jaws to engage at opposite sides of'the disk flange and form therewith wedge member carrying sockets, and said wedge members comprising balls adapted to engage and be guided in raceways formed in the opposite faces of the disk flange.

10. An intermittently rotatable device as claimed in claim 6, wherein the wedge members comprise balls, springs in the sockets, and clips to confine the springs in the sockets between said clips and the balls to urge the balls in a direction toward the reduced end of the sockets.

Signed at the city of New York, in the county of New York and State of New York, this 14th day of April, 1927.

I-IERMANN A. KL'EMM. 

